scrollView滑动控件

sd

是iOS中的滑动控件,可以来解决当药显示内容个区域超过屏幕大小时,可以通过滑动操作看全内容区域,他是滑动控件的基类.UITableView.UITextView的父类
属性
设置内容区域的大小 contentSize
关闭水平指示器 showsHorizontalScrollIndicator
关闭竖直指示器
showsVerticalScrollIndicator
设置是否可以滑动
scrollEnabled
关闭反弹效果
bounces
设置偏移量
contentOffset其实是修改的scrollView的bounds的origin
x 变大往左走 y变大往上走
控制scrollView滑动是单向滑动,就是不能即向上又向又
关闭当内容区域小于scrollView时的反弹效果
水平
alwaysBounceHorizontal
竖直
alwaysBounceVertical
设置点击顶部状态条,scrollView内容是否回到顶部
scrollsToTop
有自己的专一的协议 
UIScrollViewDelegate
和缩放有关的属性
minimumZoomScale 最小比例
maximumZoomScale 最大比例
协议中的方法
//scrollView 只要滑动就会触发 - (void)scrollViewDidScroll:(UIScrollView *)scrollView {    NSLog(@"%s, %d",__FUNCTION__, __LINE__); }// any offset changes//只要缩放就会触发 - (void)scrollViewDidZoom:(UIScrollView *)scrollView NS_AVAILABLE_IOS(3_2) {   NSLog(@"%s, %d",__FUNCTION__, __LINE__); }//当手指触摸到scrollView,scrollView将要拖拽时触发 - (void)scrollViewWillBeginDragging:(UIScrollView *)scrollView {   NSLog(@"%s, %d",__FUNCTION__, __LINE__); }//当手指当要离开scrollView,scrollView将要结束拖拽时触发 - (void)scrollViewWillEndDragging:(UIScrollView *)scrollView withVelocity:(CGPoint)velocity targetContentOffset:(inoutCGPoint *)targetContentOffsetNS_AVAILABLE_IOS(5_0) {   NSLog(@"%s, %d",__FUNCTION__, __LINE__); }//当手指离开scrollView,scrollView结束拖拽时触发 - (void)scrollViewDidEndDragging:(UIScrollView *)scrollView willDecelerate:(BOOL)decelerate {    NSLog(@"%s, %d",__FUNCTION__, __LINE__); }//此时手指已经离开scrollView//当scrollView将要开始减速时触发(减速的前提是必须要加速) - (void)scrollViewWillBeginDecelerating:(UIScrollView *)scrollView {   NSLog(@"%s, %d",__FUNCTION__, __LINE__); }// called on finger up as we are moving//当scrollView结束减速时触发 - (void)scrollViewDidEndDecelerating:(UIScrollView *)scrollView {//    [scrollView setContentOffset:CGPointMake(320, 400) animated:YES];    NSLog(@"%s, %d",__FUNCTION__, __LINE__); }// called when scroll view grinds to a halt//当对scrollView修改时并且带有动画效果时触发 - (void)scrollViewDidEndScrollingAnimation:(UIScrollView *)scrollView {    NSLog(@"%s, %d",__FUNCTION__, __LINE__); }//设置scrollView缩放的视图必须是scrollView的子视图 - (UIView *)viewForZoomingInScrollView:(UIScrollView *)scrollView {   NSLog(@"%s, %d",__FUNCTION__, __LINE__);//指定缩放视图   return [self.viewviewWithTag:100]; }//将要开始缩放时触发 - (void)scrollViewWillBeginZooming:(UIScrollView *)scrollView withView:(UIView *)viewNS_AVAILABLE_IOS(3_2) {   NSLog(@"%s, %d",__FUNCTION__, __LINE__); }//当scrollView结束缩放时 - (void)scrollViewDidEndZooming:(UIScrollView *)scrollView withView:(UIView *)view atScale:(CGFloat)scale {   NSLog(@"%s, %d",__FUNCTION__, __LINE__); }//当询问点击状态下scrollView是否能回到顶部时触发.//如果属性scrollTop:设置为yes.然后进一步询问代理方法//如果属性scrollToTop设置为no,无需进一步询问代理方法 - (BOOL)scrollViewShouldScrollToTop:(UIScrollView *)scrollView {       NSLog(@"%s, %d",__FUNCTION__, __LINE__);    returnNO; }// return a yes if you want to scroll to the top. if not defined, assumes YES//当scrollView点击状态条回到顶部时触发 - (void)scrollViewDidScrollToTop:(UIScrollView *)scrollView {   NSLog(@"%s, %d",__FUNCTION__, __LINE__); }